Using nccopy, setting deflate level to 0 ignores chunking specification

[cofinoa]

Environment

• [ X] Linux
• [ X] 64-bit
• tested on v4.4.1 and v4.3.3.1

Summary of Issue

When -d0 flag is been used nccopy ignores chunking (-c option). If -d1 (or any other valid value !=0) is been used then the chunking is applied.

References

This issue relates to #23 and has been raised by @MJones810

Steps to reproduce the behavior

$ ncgen -k4 test.cdl 
$ ncdump -hs test.nc
netcdf test {
dimensions:
	dim1 = 240 ;
	dim2 = 180 ;
variables:
	double u(dim1, dim2) ;
		u:_Storage = "contiguous" ;

// global attributes:
		:_Format = "netCDF-4 classic model" ;
}
$ nccopy -d 0 -c 'dim1/14,dim2/10' test.nc test_d0.nc
$ ncdump -hs test_d0.nc 
netcdf test_d0 {
dimensions:
	dim1 = 240 ;
	dim2 = 180 ;
variables:
	double u(dim1, dim2) ;
		u:_Storage = "contiguous" ;

// global attributes:
		:_Format = "netCDF-4 classic model" ;
}

If a value >0 for the -d option is been used, then chunking is applied.

$ nccopy -d 1 -c 'dim1/14,dim2/10' test.nc test_d1.nc
$ ncdump -hs test_d1.nc 
netcdf test_d1 {
dimensions:
	dim1 = 240 ;
	dim2 = 180 ;
variables:
	double u(dim1, dim2) ;
		u:_Storage = "chunked" ;
		u:_ChunkSizes = 240, 180 ;
		u:_DeflateLevel = 1 ;

// global attributes:
		:_Format = "netCDF-4 classic model" ;
}